Biaxially oriented film binding-type horizontal stretching method and device

Abstract

The invention relates to a biaxially oriented film binding-type horizontal stretching method and a device. Flexible binding ropes are utilized to enable two edges of a preheated film to be bound so as to compress the surface of a longitudinal stretching roller, wherein the flexible binding ropes are outwards arranged on both sides of the longitudinal stretching roller symmetrically and helically and are less than a circle of the longitudinal stretching roller; the film rotating along with the longitudinal stretching roller is stretched in the longitudinal direction, and the friction force between the film and the binding ropes is far greater than that between the film and the surface of the longitudinal stretching roller, so that the film is stretched in a continuously linear manner in the horizontal direction at the same time when the binding ropes do a helical motion towards the outer side of the longitudinal stretching roller, and the film can be stretched synchronously in the longitudinal direction and in the horizontal direction. The two binding ropes are respectively supported by turning pulleys and tensioning pulleys to form respective closed loops, and are driven by the longitudinal stretching roller to do a circulating motion. The horizontal stretching ratio can be regulated by changing the distance between the two binding ropes at a binding entry point and a stripping point on the longitudinal stretching roller. Compared with the traditional horizontal stretching technology adopting a gripping head to clamp, the biaxially oriented film binding-type horizontal stretching method and the device are characterized by horizontal stepless stretching and small size of the device, are low in cost and energy consumption, have an easy-to-control stretching process.

Description

technical field [0001] The invention relates to a polymer material processing method and equipment, in particular to a biaxially stretched film binding type transverse stretching method and device. technical background [0002] With the improvement of the packaging industry's requirements for packaging and the rapid development of various functional film markets, biaxially oriented films have good tensile properties (the tensile strength is 3-5 times that of unstretched films), barrier properties, Optical performance, heat and cold resistance, dimensional stability, thickness uniformity and other properties, and has the characteristics of fast production speed, large capacity and high efficiency, and has become the focus of attention. [0003] Biaxially stretched film technology has two categories: sequential stretching and synchronous stretching. At present, the biaxially stretched film technology in the domestic and foreign markets mainly adopts the sequential stretching ...

AI Technical Summary

Problems solved by technology

However, this synchronous stretching technology makes the chain clamps carried by the sliders driven by synchronous linear induction AC motors, which increases the manufacturing cost of the equipment and increases energy consumption. At the same time, this technology has the characteristics of difficulty in control and huge equipment structure.

[0005] In view of the problems of large equipment structure, high cost, high energy consumption and difficult control in the current biaxial stretching technology and equipment, it is of great significance to develop a new type of biaxial stretching method and equipment to solve the above problems

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